Datasheet

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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
MDC_UEI15W.C14 Page 4 of 17
Absolute Maximum Ratings
Absolute maximums are stress ratings. Exposure of devices to greater than any
of these conditions may adversely affect long-term reliability. Proper operation
under conditions other than those listed in the Performance/Functional Specifi -
cations is neither implied nor recommended.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-
332 Method 1, Case 3, ground fi xed conditions, Tpcboard=+25 deg.C, full load,
natural air convection.
(5) The On/Off Control is normally controlled by a switch. But it may also be
driven with external logic or by applying appropriate external voltages which are
referenced to Input Common. The On/Off Control Input should use either an open
collector or open drain transistor.
(6) Output current limiting begins when the output voltage degrades
approximately 2% from the selected setting.
(7) The outputs are not intended to sink appreciable reverse current. This may
damage the outputs.
(8) Output noise may be further reduced by adding an external fi lter. See I/O Fil-
tering and Noise Reduction.
(9) All models are fully operational and meet published specifi cations, including
“cold start” at –40°C.
(10) Regulation specifi cations describe the deviation as the line input voltage
or output load current is varied from a nominal midpoint value to either extreme.
(11) The output overvoltage protection is automatic recovery after fault
removal. The overvoltage may occur either from internal failure or from an
external forcing voltage as in a shared power system.
(12) Output current limit and short circuit protection is non-latching. When the
overcurrent fault is removed, the converter will immediately recover.
(13) Do not exceed maximum power specifi cations when adjusting the output
trim.
(14) At zero output current, the output may contain low frequency components
which exceed the ripple specifi cation. The output may be operated indefi nitely
with no load.
(15) If reverse polarity is accidentally applied to the input, to ensure reverse in-
put protection with full output load, always connect an external input fuse in series
with the +V
IN input. Use approximately twice the full load input current rating at
minimum input voltage.
(16) “Hiccup” operation repeatedly attempts to restart the converter with a
brief, full-current output. If the overcurrent condition still exists, the restart current
will be removed and then tried again. This short current pulse prevents over-
heating and damaging the converter. Once the fault is removed, the converter
immediately recovers normal operation.
(17) On model UEI15-050-Q48, if V
IN <20V, output trim may only be adjusted
downwards from +5.0V (more negative).
(18) Typical values shown. For minimum and maximum values see table below.
CAUTION: This product is not internally fused. To comply with safety
agency certifi cations and to avoid injury to personnel or equipment, the user
must connect an external fast-blow fuse to the input terminals. See fuse
information.
(19) All models require 10% of Imax minimum output load to meet specifi -
cations. However, they will not be damaged at zero output load.
SPECIFICATION NOTES
(1) All models are tested and specifi ed with external capacitors listed in the
table below. The external capacitors listed below are ONLY for establishing test
specifi cations. They are required for our test fi xtures and equipment. Your applica-
tion may not need them. The converter is stable with no external capacitors but
Murata Power Solutions strongly recommends external caps. All caps are low-ESR
types. Where two or more capacitors are listed, these are connected in parallel. All
caps should mount close to the DC/DC using short leads.
All specifi cations are typical unless noted. General conditions for Specifi ca-
tions are +25 deg.C, V
IN=nominal, VOUT=nominal, full load. Adequate airfl ow must
be supplied for extended testing under power.
(2) Input Ripple Current is tested and specifi ed over a 5 Hz to 20 MHz band-
width. Input fi ltering is C
IN=33 μF, 100V tantalum, CBUS=220 μF, 100V electro-
lytic, L
BUS=12 μH.
(3) Note that Maximum Power Derating curves indicate an average current at
nominal input voltage. At higher temperatures and/or lower airfl ow, the DC/DC
converter will tolerate brief full current outputs if the total RMS current over time
does not exceed the Derating curve. All Derating curves are presented at sea level
altitude. Be aware of reduced power dissipation with increasing density altitude.
ABSOLUTE MAXIMUM RATINGS
Input
Voltage
Q12 models
Volts Max. continuous
36 VDC
Volts, transient 100mS
50 VDC
Q48 models
Volts Max. continuous
75 VDC
Volts, transient 100mS
100 VDC
On/Off control,
referred to –V
IN
Volts, Min.
–0.3
Volts, Max.
15
Input Reverse Polarity Protection
See fuse section
Output Overvoltage, Volts Max.
VOUT nom. +20%
Output Current, sustained short circuit
Current-limited, see specs
Storage Temperature
Range, Min. ºC
-55
Max. ºC
+125
INPUT/OUTPUT EXTERNAL TEST CAPACITORS
Model Input Capacitor Output Capacitor(s)
UEI15-033-Q12 100 μF 1 μF & 10 μF
UEI15-033-Q48 4.7 μF ceramic 1 μF & 10 μF
UEI15-050-Q12 100 μF 1 μF & 10 μF
UEI15-050-Q48 4.7 μF ceramic 1 μF & 10 μF
UEI15-120-Q12 100 μF 1 μF & 10 μF
UEI15-120-Q48 4.7 μF ceramic 1 μF & 10 μF
UEI15-150-Q12 100 μF 1 μF & 10 μF
UEI15-150-Q48 4.7 μF ceramic 1 μF & 10 μF
Root Models Conditions Minimum Typical Maximum Units
All UEI15 Q12 Start up at –40°C 10 10.5 11 Vdc
Root Models Conditions Minimum Maximum Units
All UEI15 Q12 @+25°C 8.8 10 Vdc